Quality of Service Priority and Preemption. Brian Kassa Director of Technology Planning and Development
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1 Quality of Service Priority and Preemption Brian Kassa Director of Technology Planning and Development
2 What are Quality of Service, Priority and Preemption (QPP)? Hi, I m Fred! Quality of Service Quality of Service is the overall performance of a telephony or data network, particularly as seen by the users of the network. To measure quality of service quantitatively, several related aspects of the network service are often considered, such as error rates, bandwidth, throughput, transmission delay, availability and jitter. Priority Priority is a network capability that enables a user s application or usage of the network to take precedence over another user s application or usage of the network. Preemption A network capability that permits authorized high priority traffic, e.g., coming from public safety or first responders, to take over resources assigned to lower priority traffic, e.g., private traffic. Hi, I m Sam! 2
3 Yeah I know That, But What Does This Mean? Quality of Service, Priority and Preemption are very broad terms for a very large set of 3GPP features and functionality that FirstNet and its partner will utilize to ensure that the first responders have priority access to Band 14 when they need it and if the situation requires it, prioritization among first responders. 3
4 We Speak Different Languages Does It Work When I Need It? Guaranteed Bit Rate Best Effort Jitter Operations Delay Public Safety Cellular Engineers 4
5 We Speak Different Languages Does It Work When I Need It? Guaranteed Bit Rate Best Effort Jitter Operations Delay Preemption = lower UE MBR Priority = ARP and Quality of Service = QCI and GBR Public Safety We Need A Rosetta Stone Cellular Engineers 5
6 The FirstNet Network Imagine a 6 Lane Highway (Only one direction shown here) Every ~5 Miles of Highway Supports: Active Users 1000 s of Idle Users Entrance Exit 6
7 Quality of Service Quality of Service = Setting Cruise Control at 70 Miles Per Hour and driving 70 Miles Per Hour 70 Entrance Exit 7
8 Priority Priority = This Lane is Yours, everyone else move over Entrance Exit 8
9 Preemption: Among First Responders Preemption = Everyone Else must slow down and move over so that you can speed up Entrance Exit 9
10 Preemption: Between Primary Users and Secondary Users Under a CLA Secondary Users are removed instantaneously from the highway when Public Safety use demands it. Preemption = Secondary Users Under a Covered Leasing Agreement must exit Entrance Exit 10
11 LTE is a Cellular Technology Sector A Sector B Sector C Sector A Sector B Sector C One Cell Site With 3 Sectors 11
12 Cell-Sector Capacity Backhaul (~100 Mbps) Active Bearers (~1300+) Connected Users (~400+) Idle Registered Users (~1000+) User Throughput CELL EDGE Throughput High Low 12
13 An Ideal Coverage Map 13
14 A Realistic Coverage Map Excellent Signal Very Good Signal Good Signal Acceptable Signal Poor Signal No Signal 14
15 Each Sector Can Be Independently Managed Sector A Load = 70% Sector C Load = 10% Sector B Load = 50% 15
16 QPP Control Single Sector 16
17 QPP Control Two Adjoining Sectors 17
18 QPP Control Three Adjoining Sectors 18
19 QPP Control Multiple Cell Sites Uh Oh! I need More Water 19
20 QPP Control Multiple Incidents Independently 20
21 QPP Control Now What to Do? Uh Oh! I need More Water Can I Help? 21
22 Rosetta Stone The QPP Framework The QPP Framework is a construct that Allows engineers and first responders to talk about QPP without diving too deeply into each other area of expertise Enables a way to describe network functionality Describes what the network needs to know in order to make decisions in the rare cases that the network become overloaded with first responder traffic 22
23 The QPP Framework At a High Level Every Cell Sector Across the Nation will be in one of three states Static The network will automatically apply QPP based on what has been pre-configured when provisioned Dynamic The network will accept input from First Responders to help mitigate congestion between First Responders. Controlled The network must have input to reduce congestion between First Responders. The network can also handle a man down or responder emergency situation at the same time When needed, the network will take resources from secondary users to give to first responders 23
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